<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.box1 {
				width: 0;
				height: 0;
				border-top: 50px solid red;
				border-bottom: 50px solid green;
				border-left: 50px solid gold;
				border-right: 50px solid blue;
			}
			.box2 {
				width: 0;
				height: 0;
				border-top: 50px solid red;
				border-bottom: 50px solid transparent;
				border-left: 50px solid transparent;
				border-right: 50px solid transparent;
			}
		</style>
	</head>
	<body>
		<!-- 
		 
		 -->
		 <div class="box1"></div>
		 <br>
		 <div class="box2"></div>
	</body>
</html>
